Summary
We present B, V and I photometry with HST/ACS of the resolved stellar populations in the Magellanic starburst galaxy NGC 4449. Our photometry provides ≈ 300,000 objects in the (B, V) color-magnitude diagrams (CMDs) and ≈ 400,000 objects in the (V, I) CMDs. The features observed in the CMDs imply a variety of stellar ages up to at least 1 Gyr, and possibly as old as a Hubble time. Our data clearly indicate the presence of an age gradient, with young and intermediate-age stars concentrated toward the galactic center, and old stars present everywhere. We derive the distance of NGC 4449 with an accuracy of 5% from the tip of the red giant branch: D = 3.82 ± 0.18 Mpc.
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References
Annibali, F., Aloisi, A., Mack, J., Tosi, M., van der Marel, R. P., Angeretti, L., Leitherer, C., & Sirianni, M.: AJ, submitted, arXiv:0708.0852 (2007)
Steidel, C. C., Giavalisco, M., Pettini, M., Dickinson, M., & Adelberger, K. L.: ApJ, 462, L17 (1996)
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© 2008 Springer Science+Business Media B.V.
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Annibali, F. et al. (2008). New HST/ACS Data of the Starburst Irregular Galaxy NGC 4449. In: Jerjen, H., Koribalski, B. (eds) Galaxies in the Local Volume. Astrophysics and Space Science Proceedings. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6933-8_59
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DOI: https://doi.org/10.1007/978-1-4020-6933-8_59
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